ABSTRACTS OF TECHNICAL ARTICLES 771 



Keller, A. C/ 

 Economics of High-Speed Photography, S.M.P.T.E., Jl., 59, pp. 

 365-368, Nov., 1952 (Monograph 2052). 



The economics of the use of high-speed photography in research and develop- 

 ment work are discussed. High-speed photography is a relatively new tool 

 for engineers which can be used to measure mechanical or electrical effects 

 or both at the same time. Examples are given which illustrate the savings in 

 engineering manpower as well as ii materials, devices and systems. 



Kern, H. E., see J. J. Lander. 



KocK, W. E.,^ AND R. L. Miller.^ 



Dynamic Spectrograms of Speech, Letter to the Editor, J. Acoust. 

 Soc. Am., 24, pp. 783-784, Nov., 1952. 



KocK, W. E.' 

 Problem of Selective Voice Control, J. Acoust. Soc. Am., 24, pp. 

 625-628, Nov., 1952 (Monograph 2048). 



The development of devices which can be operated automatically from the 

 phonetic content of speech may be viewed in terms of the more general prob- 

 lem of the reduction of channel capacity in communications systems. Signifi- 



, cance has been observed in formant positions and movements as regard the 

 identification of speech sound. The basic problems in the derivation of pho- 

 nemes from the formant patterns are reviewed. 



Lander, J. J.,^ H. E. Kern^ and A. L. Beach^ 



Solubility and Diffusion Coefficient of Carbon in Nickel: Reaction 

 Rates of Nickel-Carbon Alloys with Barium Oxide, J. Appl. Phys., 

 23, pp. 1305-1309, Dec, 1952. 



Experimental values for the solubility of carbon in nickel in the range 700°C 

 to 1300°C yield the equation In ^ = 2.480 - 4,880/T, where S is the solu- 

 bility in grams of carbon per 100 grams of nickel. Values obtained for the 

 diffusion coefficient in the same range fit the equation In D = 0.909 — 

 20,200 /T, where D is in cm^ per second. These results are of some interest 

 in the problem of the activation of thermionic oxide coated cathodes, and 

 the experimental method used to measure the diffusion coefficients is related 

 to phenomena occurring in vacuum tubes. To extend the usefulness of the 

 results in this direction, rates of reaction between diffused carbon and barium 

 oxide coatings on nickel have been measured. It was found that the rates are 

 diffusion hmited over a wide range of conditions of interest. 



Lewis, H. W.' 

 Multiple Meson Production in Nucleon-Nucleon Collisions. Revs. 

 Modern Phys. 24, pp. 241-248, Oct. 1952 (Monograph 2049). 



LiVADARY, J. P., see J. G. Frayne 

 ^ Bell Telephone Laboratories, Inc. 



